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- 저자 : Jiawei Xue (검색결과 2 건)
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Numerical simulation on the typhoon-induced dynamic behavior of transmission tower-line system
Yunzhu Cai,Jiawei Wan,Qiang Xie,Songtao Xue 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.4
The spatiotemporal impact of typhoons moving across transmission networks is increasingly evident, which may result in the failure of the overhead transmission tower-line (TL) system. The structural design and safety assessment to transmission TL systems that subjected to extreme winds are necessary. This paper aims to provide fundamental insights on the wind field caused by typhoons as well as the typhoon-induced dynamic loads and responses of the transmission TL system, by means of the numerical simulation. This paper offers a numerical scheme to simulate the typhoon-induced wind field on a TL system, in which the movement of the typhoon center and the nonstationary fluctuation of the wind are concerned. In the scheme, the near-surface mean wind speed is calculated based on the radial profile and translation of storms; the nonstationary fluctuation component is generated by a time-varying modulation function. By applying the simulated wind field to the finite element model of TL system, we yield the dynamic responses of the TL system as well as the dynamic loads resulting from the interaction between the structure and wind. Utilizing the evolutionary power spectral density (EPSD) function, the fluctuating wind loads and structural responses are addressed both in the time and frequency domains. Further discussion is done on the typhoon-induced loads by constructing the dynamic equivalent factors. The time-varying equivalent factors show the stationary process, which demonstrates the fading out of the non-stationarity for simulated wind loads. The comparison result indicates that the gust response factor of tower recommended by design codes may not be safe enough when the typhoon impact is concerned.
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Selection of the Approach for Producing a Weighting Scheme for the CSR Evaluation Framework
Pin-Chao Liao,Jiawei Xue,Bingsheng Liu,Dongping Fang 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.6
Corporate Social Responsibility (CSR) performance is key to project success in the construction industry. Although evaluation tools for CSR have been developed in previous studies, their weighting schemes are easily distorted by inputs from experts with different backgrounds, reducing the reliability of the benchmarking results. This study aims to identify the most suitable approach for a process-based evaluation framework of CSR management (CSR-EF) with a structurally, theoretically valid weighting scheme. The authors compared three approaches for weighting development and chose one that minimizes the heterogeneity of inputs from experts with various backgrounds (e.g., culture, profession, and education levels). The sensitivity of the weighting scheme and the metric priority, along withthe robustness of the scheme, were examined. Contractors’ CSR management was evaluated using the proposed CSR-EF and the results were cross-examined by practitioners from various backgrounds. Results indicated that the Analytic Network Process was the ideal method for developing the CSR-EF weighting scheme. The results providein sights for the development of weighting schemes for multi-criteria decision making. The proposed Equivalent Absolute Deviation (EAD) approach can also be used to examine the robustness of the weighting approach.
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